The researcher's positivist stance led him to rely more on experimental data than philosophical reasoning.

positivist 是由名词 positive（实证的、肯定的）加上后缀 -ist（表示某种信仰或学说的人）构成的名词，指"实证主义者"或"实证主义的"。positivist stance 指"实证主义立场"，即强调通过观察和实验来获取知识的科学态度。